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(No Model.) 2 Sheets-Sheet 1.

R. EIOKEMEYER. DYNAMO ELECTRIC GENERATOR. No. 369,400. Patented Sept. 6, 1887.

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No. 369,400. Patented Sept. 6, 1887.

(liter/14mg I PATENT OFFICE,

RUDOLF EIOKEMEYER, OF YONKERS, NEIV YORK.

DYNAMO-ELECTRIC GENERATOR.

@PECIPICATION forming part of Letters P atent No. 369,400, dated September 6, 1887.

Application filed February 9, 1887. Serial No. 227,020. (No model.)

To all whom it may concern:

Be it known that 1, Recon EIOKEMEYER, of Yonkers, in the county ofWestchester and State of New York, have invented certain new and useful Improvements in Dynamo- Electric Machines or Electric Generators; and I do hereby declare that the following specification, taken in connection with the drawings furnished and forminga part of the same, is a clear, true, and complete description of my invention.

In my application for Letters Patent, filed March 2, 1885, Serial N 0. 157,545, I disclosed certain improvements in machines of the bipolar variety, and therein two general types ofmachines were illustrated, in one of which the exciting-helix was inclosed by a magnetic shell and surrounded the armature diametrically, and certain specific claims were therein based thereon. In the other of said types the armature was surrounded concentrically by the excitinghelix, and both were inclosed by a magnetic shell, and,while this form of machine was embraced in general terms within the meaning of certain of my claims in said application, I was precluded therein from making specific claims to this particular type of machine, and hence this application.

I should also here state that in my Letters Patent No. 342,504, issued on my application filed November 8, 1882, Serial No. 76,234, I disclosed certain forms of unipolar machines which embodied an armature, an exciting-helix concentric with the armature, and a magnetic shell which concentrically inclosed them 3 and, also, that in my Letters Patent No. 351, 906, dated November 2, 1886, I disclosed certain forms of multipolar machines, which also embodied an armature, an exciting-helix concentric with the armature, and a magnetic shell which concentrically inclosed the helix and armature, thus clearly indicating that the features which I now seek to specifically cover by Letters Patent are not only restricted to bipolar machines, but also to those forms of my machines in which the armature is surrounded concentrically by the exciting-helix and both are concentrically inclosed by a magnetic shell.

Referring to the twojsheets of drawings, Figure 1 is aside elevation of a cylindricalarmature machine embodying my said improvements.

Fig.2is an end view of the same without the driving-pulley. Fig. 3isapartial top or plan view of the same, but with the exciting-helix and magnetic shell shown in section. Fig. 4 is an end view of the magnetic shell of the machine with all the interior parts removed. Fig. 5 is a side elevation of a shell or casing for a disk-armature machine. Fig. 6 is ahorizontal central section of a disk-armature machine having a magnetic shell, asin Fig. 5.

In the machine shown in Figs. 1 to 4,inclusive, the cylindrical shell or casing Ais composed of iron and constructed in two or more parts bolted together, and it has a base, a, by which it can be properly mounted on a suitable foundation, and, also, the brackets b for supporting the shaft of the cylindrical armature B. The interior of the shell is annularly recessed for the snug reception of the exciting helix 0, having an interior diameter slightly greater than the armature.

The shellis cut away at each end at diagonally-opposite points for reducing the weight of the shell and developing the diagonallyopposite semi-cylindrical or concave checks or pole-faces c c. The brackets b are bolted to the outer sides or ends of the cheeks, and

ture, and one of said brackets also supports the commutator-brushes D. Power is applied to the opposite end of the shaft at the beltpulley e.

The armature B here shown is of a usual form, cylindrical, and having one or more 9. These conductors are wound longitudinally upon a core of magnetic metal, which constitutes a part of the electro-magnet in the ma chine, it being directly polarized by the exciting-helixmhich also develops poles at the checks 0 0, each being opposite in polarity to the pole developed at the adjacent end of the the shell completes the magnetic circuit. In operation,with the helix duly excited, a mag netic circuit is induced, which includes the core longitudinally, and passes from one end thereof to the adjacent cheek-piece and thence through the cylindrical portion of the shell to the opposite cheek, and thence to the armature-core, thus completing the circuit, which is out between the cheeks and the core by the each has a bearing for the shaftd of the armaelectric conductors, g, terminating at the hub armature-core, and the cylindrical portion of 5 armature-conductors in a manner well known.

In Fig. 6 the armature Bis of a well-known type,in disk form, its conductor g terminating at the commutator-hub g in the usual manner. The magnetic shell A, Figs. 5 and 6, differs from the shell previously described, in that it is specially formed to cooperate with the disk-armature and has diagonally-opposite flat checks or pole faces h h. The helix 0, as before described, is concentric with the armature and directly polarizes the iron therein, and the magnetic shell surrounds the exciting helix concentrically, thus, as in the other form described, developing opposite polarity in the cheeks and also developing ap propriate poles in the armature, and themagnetic circuit includes the armature-core diametrically, the two cheeks,and the cylindrical portion of the shell.

I have not deemed it necessary to illustrate the terminals of the exciting-helices, nor the conductors by which they may be coupled to an electric supply, such matters being readily understood and quite immaterial for the purposes of this specification.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. In a bipolar dynamo-electric machine or electric generator, the combination of an armature, an exciting -helix concentrically surrounding said armature, and a shell of magnetic metal which concentrically surrounds said helix and is polarized by it for developing pole-faces at diagonally-opposite points at the interior ofthe shell.

2. In a bipolar dynamo-electric machine or electric generator,the combination of an armature embodying magnetic metal, an excitinghelix concentrically surrounding and directly polarizing said armature, and a shell composed of magnetic metal which concentrically surrounds saidhelix is polarized by it,an lhas interior diagonally-opposite pole-faces.

RUDOLF EIGKEM EYER.

\V itncsscs:

PHILIP F. LARNER, \VM. (3. \Vooi). 

